Readme updated with step by step expected visual result on the scanner.

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Readme for the following examples have been updated:

• BLE_BatteryLevel
• BLE_Beacon
• BLE_Button
• BLE_EddystoneService
• BLE_GAPButton
• BLE_HeartRate
• BLE_LED
• BLE_Thermometer
• BLE_URIBeacon

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@adbridge Could you review this please ?

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Thank you for your comments Anna, I have updated the PR accordingly.

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I merge.